[llvm] [lit] Support GoogleTest test discovery through prefixes, too (PR #137423)

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``````````bash
darker --check --diff -r HEAD~1...HEAD llvm/utils/lit/tests/Inputs/googletest-prefix/DummySubDir/test_one.py llvm/utils/lit/lit/formats/googletest.py llvm/utils/lit/lit/util.py
``````````

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View the diff from darker here.
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``````````diff
--- lit/formats/googletest.py	2025-04-26 00:14:49.000000 +0000
+++ lit/formats/googletest.py	2025-04-26 00:20:56.099064 +0000
@@ -54,11 +54,13 @@
         source_path = testSuite.getSourcePath(path_in_suite)
         for subdir in self.test_sub_dirs:
             dir_path = os.path.join(source_path, subdir)
             if not os.path.isdir(dir_path):
                 continue
-            for fn in lit.util.listdir_files(dir_path, suffixes=self.test_suffixes, prefixes=self.test_prefixes):
+            for fn in lit.util.listdir_files(
+                dir_path, suffixes=self.test_suffixes, prefixes=self.test_prefixes
+            ):
                 # Discover the tests in this executable.
                 execpath = os.path.join(source_path, subdir, fn)
                 if execpath in self.seen_executables:
                     litConfig.warning(
                         "Skip adding %r since it has been added to the test pool"

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https://github.com/llvm/llvm-project/pull/137423